Underdrive pulley
Thread Starter
Launching!
Joined: Sep 2006
Posts: 226
Likes: 0
From: Kentucky
Underdrive pulley I've seen several dyno posts claiming 7-12rwhp from underdrive pulleys. No doubt they free up power. I have 2 huge amplifiers (1400W Soundstream 4ch & Kicker zx850.2), and to run an underdrive pulley on the crank would have to run an overdrive alternator pulley. What kind of gain do you think an underdrive/overdrive setup would offer? 2-3HP?
Thread Starter
Launching!
Joined: Sep 2006
Posts: 226
Likes: 0
From: Kentucky
Sounds like a lot of mixed opinions in that thead. I have used underdrive pulleys in the past, and they always have seemed to allow a faster rev and create a hair more power - although I never dynoed. If it wasn't for having to use an overdrive pulley on the alt, I wouldn't hestiste on my WS6. I may wait on this mod until after the camshaft. I know a good cam will give me good gains.
With a larger system like you have, I'd skip this one. The gains are pretty small...good if you are looking for that last little bit, but not if you are looking for the most bang for the buck.
From my personal experience:
I've had my Powerbond 25% underdrive pulley for quite some time, but I'll be ditching it and going back to a stock sized ATI superdamper. Before my aftermarket alternator (160-amp) went out, I had to idle my engine at 925 RPMs to get it to charge. I'm sure that had more to do with the alternator than anything, but it was still a pain to deal with (and it seems like it is a common problem with aftermarket alternators).
I've had my Powerbond 25% underdrive pulley for quite some time, but I'll be ditching it and going back to a stock sized ATI superdamper. Before my aftermarket alternator (160-amp) went out, I had to idle my engine at 925 RPMs to get it to charge. I'm sure that had more to do with the alternator than anything, but it was still a pain to deal with (and it seems like it is a common problem with aftermarket alternators).
So basically its safe to say that getting an underdrive pulley is kind of a waste of money for the little gain that you are going to get from it, that you would be better off putting that money into something else?
Trending Topics
Originally Posted by HIPER-Z
So basically its safe to say that getting an underdrive pulley is kind of a waste of money for the little gain that you are going to get from it, that you would be better off putting that money into something else?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Launching!
Joined: Sep 2006
Posts: 226
Likes: 0
From: Kentucky
Originally Posted by HIPER-Z
So basically its safe to say that getting an underdrive pulley is kind of a waste of money for the little gain that you are going to get from it, that you would be better off putting that money into something else?
Originally Posted by jag42420
Sounds like a lot of mixed opinions in that thead. I have used underdrive pulleys in the past, and they always have seemed to allow a faster rev and create a hair more power - although I never dynoed. If it wasn't for having to use an overdrive pulley on the alt, I wouldn't hestiste on my WS6. I may wait on this mod until after the camshaft. I know a good cam will give me good gains.
Originally Posted by jag42420
An underdrive pulley will generally free up power for a reasonable cost, but I would have to have an overdrive pulley to keep my alternator spinning enough for my stereo system (amplifiers). I love the underdrive on my SS Monte Carlos.
